Holder-on for riveting machines



Jan. 8, 1924. 1,480,464

w. A. PUNGs HOLDER ON FOR RIVETING MACHINES I j muummmmmnw Patented Jan. 8, 1924.

Param orifice.

WILLIAM A. PUNGS, OF DETROIT, MICHIGAN.

HOLDER-ON FOR' IVETING MACHINES.

Application led October 16, 1920. Serial No. 417,345.

To all whom t may concern.'

Be it known that I7 WILLIAM A. PUNGS', a citizen of the United States of America, residing at Detroit, in the cou'nty of Wayne and State of Michigan, .have 'invented certain new and useful- Improvements in Holder-Ons for Riveting Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to portable riveting apparatus and has for its object to improve the construction of the holder-on employed in riveting operations.

In carrying out my invention I provide an electro-magnetic holding device to maintain a yielding support in position against the head of a rivet during the operation oi a pneumatic hammer upon the rivet.

In the drawings,

Figure 1 is a side elevation, partly in sec-V tion of my improved device in position against a rivet the metal plates being riveted shown in section; and Y F ig. 2 is an end view of the holder.

It is the current practice to support a rivet in position in a plate by a hand supported device while a pneumatic hammer is employed by a workman standing on the 0pposite side of the plate in which the rivet is being fastened. The workman sustains Vthe jar of this hammering operation and the rivet set is maintained in position by the elasticity of the workmans muscles.

I provide a framework 1 held in position against the iron or steel structure 2 by means of electro-magnets shown in the present embodiment as comprising coils 3 surrounding pole pieces 4 which are placed against the work so as to bring the yieldinghead 5 of the rivet set in position against the end of the rivet. The head 5 is removably supported in a tubular casing 6 by means of a cap 7 and is normally pressedl outward into operative position by the spring 8 of a proper strength. A handle 9 is provided for the convenient manipulation of the device and a Vswitch 10 within easy reach of the thumb.- of the operatorie provided for connecting the coils with a suitable source of electric current.

The pneumatic hammer V11 of any suitable or familiar type is used for swaging down a rivet head in the usual manner and the spring 8 allows the head 5 to yield in such manner as to prevent the holder from being jarred loose from its position on the work 2.

It will be seen that I have provided a simple eiiicient device in which the head 5 is readily interchangeable and renewable. The entire structure can be constructed very cheaply.

What I claim is Y l A device for the purpose described comprising` a pair of electro-magnets, a tubular casing mounted between said magnets, a head having an enlarged inner end portion to slide within said tubular casing, anV outer reduced end portion to Vproject from the casing, a `cap detachably Asecured tothe end of the casing and having an opening' through which the'reduced outer end portion of the head projects, said cap forming a stop to limit the outward movement of said head and being detachable for the ready'removal of the head irom the casing, and a spring within said tubular casing engaging the inner end of said head to normally hold the head with its reduced end portion projected from the casing.

In testimony whereof I my signature in presence of two witnesses.

WILLIAM .4. roues. Witnesses ANNA M. DoRR, O. F. BARTHEL. 

